Jinn (Arabic: Ø§ÙØ¬Ùââ, al-jinn), also romanized as djinn or anglicized as genies (with the more broad meaning of spirits), are supernatural creatures in early Arabian and later Islamic mythology and theology. An individual member of the jinn is known as a jinni, djinni, or genie (Ø§ÙØ¬ÙÙ, al-jinnÄ«). They are mentioned frequently in the Quran (the 72nd sura is titled SÅ«rat al-Jinn) and other Islamic texts.
Once you tighten up and lose range of motion in your arms, it reduces stride length, which is difficult to get back without burning a lot of energy. While sprinting, it is important to get a full range of motion with the arms. Remember, speed is a product of stride length and stride frequency. Stride length and frequency are determined, in part, by the motion of the arms. If you are lazy or passive with your arm action, you are limiting your potential for speed.
Speed work such as sprinting isn't the primary method for muscle growth, but it does speed up the hypertrophy process. So think of sprinting as a secondary technique for size, one that can get us to our size destination much faster. â Speed Work Prevents Fat Gain. Speed training creates a huge metabolic disturbance and is one of the best methods for losing or maintaining fat stores. According to the many DEXA scans I've run on athletes and clients, body fat stores rapidly decrease and muscle size increases once sprinting is employed.